#include "date.h"
Date::Date(int year, int month, int day)
	:_year(year),_month(month),_day(day)
{
}

Date::Date(const Date& d)
	:_year(d._year), _month(d._month),_day(d._day)
{
}

Date& Date::operator=(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
	return *this;
}

bool Date::operator>(const Date& d) const
{
	if (_year > d._year)
	{
		return true;
	}
	else if (_year == d._year)
	{
		if (_month > d._month)
		{
			return true;
		}
		else if (_month == d._month)
		{
			return _day > d._day;
		}
	}
	return false;
}

bool Date::operator==(const Date& d) const
{
	return _year == d._year && _month == d._month && _day == d._day;
}
bool Date::operator>=(const Date& d) const
{
	return *this > d || *this == d;
}
bool Date::operator<(const Date& d) const
{
	return !(*this >= d );
}
bool Date::operator<=(const Date& d) const
{
	return !(*this > d);
}
bool Date::operator!=(const Date& d) const
{
	return !(*this == d);
}

Date& Date::operator+=(int day) 
{
	_day += day;

	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;
		if (_month == 13)
		{
			++_year;
			_month = 1;
		}
	}
	return *this;
}
Date Date::operator+(int day) const
{
	Date tmp(*this);

	tmp += day;
	return tmp;
}
Date& Date::operator-=(int day)
{
	_day -= day;

	while (_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			_month = 12;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}
Date Date::operator-(int day) const
{
	Date tmp(*this);
	tmp -= day;
	return tmp;
}
Date& Date::operator++()
{
	*this += 1;
	return *this;
}
Date Date::operator++(int)
{
	Date tmp(*this);
	*this += 1;
	return tmp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}
Date  Date::operator--(int)
{
	Date tmp(*this);
	*this -= 1;
	return tmp;
}
int  Date::operator-(const Date& d) const
{
	Date mind = *this;
	Date maxd = d;

	if (mind > maxd)
	{
		swap(mind, maxd);
	}
	int count = 0;
	while (mind != maxd)
	{
		++mind;
		count++;
	}
	return count;
}
ostream& operator<<(ostream& out, const Date& d)
{
	out << d._year << '/' << d._month << '/' << d._day << endl;
	return out;
}
istream& operator>>(istream& in, Date& d)
{
	in >> d._year >> d._month >> d._day;
	return in;
}